Neutrinoless double-beta decay of the $Δ^-$ resonance
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917406817910784 |
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| author | He, Li-Ping Guo, Feng-Kun Meißner, Ulf-G. Yao, De-Liang Zhang, Xiao-Yu Zhang, Zhen-Hua |
| author_facet | He, Li-Ping Guo, Feng-Kun Meißner, Ulf-G. Yao, De-Liang Zhang, Xiao-Yu Zhang, Zhen-Hua |
| contents | The subprocess $nn\to ppe^-e^-$ is a key ingredient in the interpretation of nuclear neutrinoless double-beta decay. Intermediate $Δ$ resonances may provide additional enhancements to this transition. We take a first step toward a $Δ$-full description of $nn\to ppe^-e^-$ by investigating the neutrinoless double-beta decay $Δ^- \to p e^-e^-$ in the framework of chiral effective field theory. We systematically derive the long-range contribution from light-Majorana-neutrino exchange through loop diagrams and incorporate the short-range part through counterterms required by renormalization. We predict the pion-mass dependence of the decay amplitude in the kinematic configuration with collinear electrons. Furthermore, to facilitate lattice-QCD matching, we calculate the decay amplitude in the degenerate $Δ$-nucleon mass limit and provide the corresponding long-range prediction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_12535 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Neutrinoless double-beta decay of the $Δ^-$ resonance He, Li-Ping Guo, Feng-Kun Meißner, Ulf-G. Yao, De-Liang Zhang, Xiao-Yu Zhang, Zhen-Hua High Energy Physics - Phenomenology High Energy Physics - Lattice The subprocess $nn\to ppe^-e^-$ is a key ingredient in the interpretation of nuclear neutrinoless double-beta decay. Intermediate $Δ$ resonances may provide additional enhancements to this transition. We take a first step toward a $Δ$-full description of $nn\to ppe^-e^-$ by investigating the neutrinoless double-beta decay $Δ^- \to p e^-e^-$ in the framework of chiral effective field theory. We systematically derive the long-range contribution from light-Majorana-neutrino exchange through loop diagrams and incorporate the short-range part through counterterms required by renormalization. We predict the pion-mass dependence of the decay amplitude in the kinematic configuration with collinear electrons. Furthermore, to facilitate lattice-QCD matching, we calculate the decay amplitude in the degenerate $Δ$-nucleon mass limit and provide the corresponding long-range prediction. |
| title | Neutrinoless double-beta decay of the $Δ^-$ resonance |
| topic | High Energy Physics - Phenomenology High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2604.12535 |